Study ofN15States by theN

Abstract

This approach was followed for the vector current in the second paper in Ref. 5.~S ee the first paper in Ref. 5, and references therein. See, also, E. J. Konopinski, The Theory of Beta Radioactivity (Clarendon Press, Oxford, England, 1966). J. Sodermann and A. Winther, Nucl. Phys. 69, 369 (1965). We have assumed that Iz(0) &0 and f";y(0) &0.~4 Y. Nambu, Phys. Rev. Letters 4, 380 (1960). See the second paper in Ref. 1.6For P+ decay, C is negative so that a more careful analysis is necessary.We have assumed that f&(0) & 0 and f"'f(0)~0. It should be noted that if f&(0) =0, an entirely different result follows.Note that in Eq. (76) the contribution of the f2 term appears to be [Wo/(m;+mf)](f2/f&), but when combined with the lepton part, it is [m, /(m;+m&)](f2/f(). Reddy, Nuovo Cimento 3A, 699 (1971) for the latest list of references.A preliminary discussion of these results appears in Phys. Letters 41B, 39 (1972).

Separation Between $d_{5/2}$ and $s_{1/2}$ Neutron Single Particle Strength in $^{15}$N

“…These and other studies [8] discovered a rich spectrum with quite different population strengths from those observed in the (d, p) reaction. While the (d, p) reaction seemed to have little or no strength above 11 MeV, multi-particle transfer reactions populated states up to 20 MeV or more in 15 N. The present work uses the higher energy deuteron bombarding energy of 16 MeV to explore this higher energy excitation region with the 14 N(d, p) reaction. Figure 1 is a comparison of spectra from the present 14 N(d, p) 15 N work and that from previously measured spectra for 12 C( 7 Li, α) 15 N [9].…”

“…While the (d, p) reaction seemed to have little or no strength above 11 MeV, multi-particle transfer reactions populated states up to 20 MeV or more in 15 N. The present work uses the higher energy deuteron bombarding energy of 16 MeV to explore this higher energy excitation region with the 14 N(d, p) reaction. Figure 1 is a comparison of spectra from the present 14 N(d, p) 15 N work and that from previously measured spectra for 12 C( 7 Li, α) 15 N [9]. Note the presence of strong isolated peaks in ( 7 Li, α) around 12, 13, and 15 MeV in excitation that are absent in the single neutron transfer spectrum.…”

“…The nucleus 15 N was a source of early shell model studies [1] because it has a large number of unnatural parity states that were seen as a puzzle since it has two sd states around 5.3 MeV and then a multiplet of sd states around 7.7 MeV. In addition, around 9 MeV in excitation, negative parity states appear mixed with additional positive parity states.…”

“…In addition, around 9 MeV in excitation, negative parity states appear mixed with additional positive parity states. A detailed measurement of the 14 N(d, p) reaction at bombarding energies of 7, 8, and 9 MeV when coupled to an earlier work that focused on the ground state strengths in the p shell provided single particle strengths for all states in 15 N up to 10 MeV in excitation that displayed enough experimental yield to extract angular distributions [2,3]. These experimental results were then used by Lie and Engeland [4] to test their weak coupling shell model calculations.…”

“…These experimental results were then used by Lie and Engeland [4] to test their weak coupling shell model calculations. Their shell model calculations were compared to the experimentally observed levels in 15 N [5] with the aim of assigning J π values to the levels whose presence were known but with ambiguous spin parity values. Also, there was the possibility that these calculations could lead to the finding of new levels in this nucleus.…”